<html>
<head>
<meta charset="UTF-8">
<title>带缓冲效果的仿QQ面板折叠菜单代码</title>
<script>
/*
By Auntion
QQ 82874972
*/
function $G(Read_Id) { return document.getElementById(Read_Id) }
function Effect(ObjectId,parentId){
var Obj_Display = $G(ObjectId).style.display;
	if (Obj_Display == 'none'){
	Start(ObjectId,'Opens');
	$G(parentId).innerHTML = "<a href=# onClick=javascript:Effect('"+ObjectId+"','"+parentId+"');>-</a>"
	}else{ 
	Start(ObjectId,'Close');
	$G(parentId).innerHTML = "<a href=# onClick=javascript:Effect('"+ObjectId+"','"+parentId+"');>+</a>"
	}
}
function Start(ObjId,method){
var BoxHeight = $G(ObjId).offsetHeight;   //获取对象高度
var MinHeight = 5;//定义对象最小高度
var MaxHeight = 130;//定义对象最大高度
var BoxAddMax = 1;//递增量初始值
var Every_Add = 0.15;//每次的递(减)增量  [数值越大速度越快]
var Reduce    = (BoxAddMax - Every_Add);
var Add       = (BoxAddMax + Every_Add);
//关闭动作**
if (method == "Close"){
var Alter_Close = function(){//构建一个虚拟的[递减]循环
	BoxAddMax /= Reduce;
	BoxHeight -= BoxAddMax;
	if (BoxHeight <= MinHeight){
		$G(ObjId).style.display = "none";
		window.clearInterval(BoxAction);
	}
	else $G(ObjId).style.height = BoxHeight;
}
var BoxAction = window.setInterval(Alter_Close,1);
}
//打开动作*
else if (method == "Opens"){
var Alter_Opens = function(){
	BoxAddMax *= Add;
	BoxHeight += BoxAddMax;
	if (BoxHeight >= MaxHeight){
		$G(ObjId).style.height = MaxHeight;
		window.clearInterval(BoxAction);
	}else{
	$G(ObjId).style.display= "block";
	$G(ObjId).style.height = BoxHeight;
	}
}
var BoxAction = window.setInterval(Alter_Opens,1);
}
}
</script>
<style>
table{width:192px;overflow:hidden}
#control,#control table,#control table td{ font-size:12px;}
#control{ width:192px; background-color:#ccc; font-size:12px; font-color:#333333; text-align:center; }
#control table{ width:192px; height:20px; overflow:hidden}
#control table li{ list-style:none;height:20px;line-height:20px; overflow:hidden}
#control table .tabTit{background:#E0E8B8;}
#control a { font-weight:normal; font-size:24px; color:#6F7848; text-decoration:none; padding-right:10px;}
#control .testLink{ font-weight:bold; font-size:12px}
.test{ width:192px;background-color:#f6f6f6;overflow:hidden; }
.test li{ list-style:none; color:#000; font-size:13px; line-height:20px;}
#control table,.test table{ margin:0 auto; text-align:center}
.STYLE1 {
	font-size: 8px;
	color: #fff;
}
</style>
</head>
<body>
<div id="control">
  <table width="100%"  border="0" cellpadding="0" cellspacing="0">
    <tr>
 <td width="100%" align="center" class="tabTit" ><li id="testtab" style="float:right"><a href="#" onClick="Effect('test',this.parentNode.id);" >+</a> </li><li style="float:left"><a href="#" onClick="Effect('test');" class="testLink">缓冲菜单</a> </li></td>
    </tr>
  </table>
</div>
<div id="test" class="test" style="display:none;">
  <table width="100%"  border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">
    <tr>
      <td colspan="3" align="center" valign="top"><ul><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li></ul></td>
    </tr>
  </table>
</div>
<br>
<div id="control">
  <table width="100%"  border="0" cellpadding="0" cellspacing="0">
    <tr>
      <td width="100%" align="center" class="tabTit" ><li id="test1tab" style="float:right"><a href="#" onClick="Effect('test1',this.parentNode.id);" >+</a> </li><li style="float:left"><a href="#" onClick="Effect('test1');" class="testLink">缓冲菜单</a></li></td>
    </tr>
  </table>
</div>
<div id="test1" class="test" style="display:none;">
  <table width="100%"  border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">
    <tr>
      <td colspan="3" align="center" valign="top"><ul><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li><li>缓冲菜单</li></ul></td>
    </tr>
  </table>
</div>
<br>
<div id="control">
  <table width="100%"  border="0" cellpadding="0" cellspacing="0">
    <tr>
      <td width="100%" align="center" class="tabTit" ><li id="test2tab" style="float:right"><a href="#" onClick="Effect('test2',this.parentNode.id);" >+</a> </li><li style="float:left"><a href="#" onClick="Effect('test2');" class="testLink">缓冲菜单</a></li></td>
    </tr>
  </table>
</div>
<div id="test2" class="test" style="display:none;">
  <table width="100%"  border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">
    <tr>
      <td colspan="3" align="center" valign="top"><ul><li>缓冲菜单</li><li>缓冲菜单</li></ul></td>
    </tr>
  </table>
</div>
<br>
<div id="control">
  <table width="100%"  border="0" cellpadding="0" cellspacing="0">
    <tr>
      <td width="100%" align="center" class="tabTit" ><li id="test3tab" style="float:right"><a href="#" onClick="Effect('test3',this.parentNode.id);" >+</a> </li><li style="float:left"><a href="#" onClick="Effect('test3');" class="testLink">缓冲菜单</a></li></td>
    </tr>
  </table>
</div>
<div id="test3" class="test" style="display:none;">
  <table width="100%"  border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">
    <tr>
      <td colspan="3" align="center" valign="top"><ul><li>缓冲菜单</li><li>缓冲菜单</li></ul></td>
    </tr>
  </table>
</div>
<br>
<div id="control">
  <table width="100%"  border="0" cellpadding="0" cellspacing="0">
    <tr>
      <td width="100%" align="center" class="tabTit" ><li id="test4tab" style="float:right"><a href="#" onClick="Effect('test4',this.parentNode.id);" >+</a> </li><li style="float:left"><a href="#" onClick="Effect('test4');" class="testLink">缓冲菜单</a></li></td>
    </tr>
  </table>
</div>
<div id="test4" class="test" style="display:none;">
  <table width="100%"  border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">
    <tr>
      <td colspan="3" align="center" valign="top"><ul><li>缓冲菜单</li><li>缓冲菜单</li></ul></td>
    </tr>
  </table>
</div>
</body>
</html>